Never send your phone to MTN for Repair

I bought a Nokia Lumia 630 on the 16/07/2015, not even a month afterwards the phone just died on me at work, I took it in to Foschinni were I bought it on the 14/08/2015, the lady took it in for repair, on the 1/9/2015 I got a sms that it will cost me R2518 to be repaired, a whole R1000 more than what I have bought it for, I told them but the phone is under warranty why so much, no the technician saw the is liquid damage, I was not even close to something liquid how can that happen. and why so much for repair. I thought I will just do a sim card upgrade and buy a phone I like. one lesson to be learned don't trust a place where you bought a phone and don't even trust MTN for repair cause they lie what is wrong with your phone just to make money.